wedding-planner/app/models/group.rb

# Copyright (C) 2024 Manuel Bustillo

class Group < ApplicationRecord
  validates :name, uniqueness: true
  validates :name, :order, presence: true

  has_many :children, class_name: 'Group', foreign_key: 'parent_id'
  belongs_to :parent, class_name: 'Group', optional: true

  before_create :set_color

  scope :roots, -> { where(parent_id: nil) }

  has_many :guests

  def colorize_children(generation = 1)
    derived_colors = generation == 1 ? color.paint.palette.analogous(size: children.count) : color.paint.palette.decreasing_saturation

    children.zip(derived_colors) do |child, raw_color|

      final_color = raw_color.paint
      final_color.brighten(60) if final_color.dark?

      child.update!(color: final_color)

      child.colorize_children(generation + 1)
    end
  end

  private

  def set_color
    new_color = "##{SecureRandom.hex(3)}".paint
    new_color = new_color.lighten(30) if new_color.dark?
    self.color = new_color
  end
end